Coal drill



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. N. D. LEvlN COAL DRILL Filed April '19, 1921 2 sheets-Sheet 2 A TTORNE Patented May 4, 1926.

UNITED STATES recaen Paisnrl orties.

NILS D. LEVIN, OF COLUMBUS, OHIO, .ASSIGNOR TO THE JEFFREY MANUFACTURING COMPANY, OF COLUMBUS, OHIO, A CORPORATION OF OHIO.

COAL DRILL.

Application filed .April 19, 1921. Serial No. 4G2,727.

To all fui/710m t may conce/m:

Be it known that I, NrLs D. LnvrN, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Coal Drills, of which the following is a specilication, reference being had therein to the accompanying drawing.

The present invention relates to certain new and useful improvements in coal drills of the classA adapted to form incisions in the coal body for the reception of the charges of explosive by which the coal is blasted down.

The especial object is to provide a convenient, light and durable drill supporting and actuating mechanism, arranged to guide the drill to form incisions in any one of a large variety of positions, and by which the rate of advance of the drill tool may be varied according to the hardness of the coal.

The devices by which I attain these objects are fully set forth in the following specification and illustrated in the accompanying drawings of which Fig. 1 is a side elevation of the preferred embodiment of my invention adjusted to form an incision in the coal near the top of the vein.

Fig. 2 is a plan view, and

Fig. 3 4is a front elevation of the mechanism illustratedl in Fig. 1.

Fig. is a fragmentary plan lview on an enlarged scale of the sliding carriage by which the drill actuating motor is movably supported upon the supporting frame.

Fig. 5 is a sectional view taken along the line V-V of Fig. 4C.

Fig. 6 is a sectional view taken along the lineL VI-VI of Fig. 4. l

Fig. 7 is a sectional view taken along the line VII-VII of Fig. t. Y

Fig. 8 is a sectional view ta'len along the line VIII-VIII of Fig. l.

Fig. 9 is a detail of the drill feeding mechanism. y

Fig. 10 is a side elevation, similar to Fig.

1, showing the apparatus adjusted to formy an incision in the coal near the base of the vein.

Like numerals referto similar parts in the several g'ures. j

j As shown in the drawings, the supporting frame comprises post- 1 and a slide'- way2,

adapted to be held in adjustable relation to each other and to the coal in which blast holes are to be drilled. The post 1 is formed of two parallel angle bars 3 joined together at their ends by steel blocks 4 and 5 to which they are secured in any preferred manner, as for example, by electric welding. The bottom block 5 is pierced by a longitudinal aperture in which the bottom point 6 is longitudinally slida-ble, and by a transverse aperture through which the locking pin 7 extends to engage any one of the apertures 8 of the bottom point 6v to lock it in the preferred position of longitudinal adjustment. The top block e is provided with a longitudinal aperture in which the top point 9 is screw threaded, a cross bar 10 being provided for its convenient manipulation. By the adjustment of the bottom and top points 6 and 9 the post 1 may be securely anchored between the licor and the roof of the mine in any preferred position relative to the coal race. l l

Formed in the angle bars 3 are a plurality of spaced apertures 11 through which may be thrust the connecting pins 12 and 13. The connecting pin 12 is adapted to engage a suitable aperture near the inner end of the guide way 2, and the pin 13 is adapted to similarly engage a suitabley aperture at the inner end of the brace 14. The outer end of ythe brace 14 is connectable to the guide way 2 by a pin 15 extending through one of the spaced apertures 16 in the guide way 2. By the arrangement of parts just described the guide way 2 may be rigidly connected to the post lat any preferred angle and at a variety of elevations. 4

The guide way 2 is formed of two parallel angle bars 17 connected together by suitable cross members 18 and 19. Formed in the cross member 19 at the inner end of the guide member 2 is a saddle 20 in which the forward end of the drill tool '21 maybe loosely supported and guided.

The drill tool 21 is of a type well known in the coal mining art, having a cutting edge at its inner end and a helicoid body adapted to draw-the cuttings outwardly of the drill hole. At its outer end the tool 21 is shaped to engage a socket 22 y'directly connected to the armature shaft of a suitable electric Inotor 23. Electric current vfor the actuation of the motor 23 is received from any eoiiven ient source of electrical supply through the.

at a suitable rate of advance.

couductorcable 24, and is routrolledby a suitable switch 25 in the manner well understood in the art. The motor 23 is mounted upon a carriage 26 which is slidable longitudinally of the guide ways 2, and this motor is securely held in place upon the carriage by L! bolts 27 the ends of which extend through suitable apertures in the cross bars 23. ihe carriage 26 comprises a base plate 29 adapted to slide upon the upper surface of the horizontal flanges 3() of the angle bars 17, and .to this base plate 29 are attached, in any suitable manner such as by electric welding, riveting, or t-he like, the flange strips 31 which engage the inner edges and lower surface of the horizontal flanges 30 to prevent accidental displacement of said carriage. To the base plate 29 are attached the upwardly extending flanges 32 in the rearward end of which are formed open, longitudinally extending'- notches 33 at the inner ends of which the shaft 34 of the feedingmechanism may yfind a bearing. To the shaft 34C are attached two rollers 35 upon the peripheries of which are formed sprocket teeth 36 adapted to engage spaced apertures 37 of the horizontal flanges A3() to serve as a pinion and rack for moving the carriage forwardly upon the guide way. A crank 38 attached to the shaft 3e affords means to rotate the pinions 35, and the leverage of said crank 38 may be adjusted to vary the pressure exerted by the feed shaft 34 upon the carriage. Rollers 39, attached to the underside of the carriage, engage the underside of thehorizontal vflanges 30 to insure engagement of the sprocket teeth 36 with the apertures 37.

vPreparatory to operation, the supporting post 1 is set in the preferred positionvm proximity to the coal face, andv securely anchored by the adjustment of the' top andbottom points 6 and 9. The guide way 2 is then placed at the desired elevation andthe connecting pin 12 inserted through the preferred aperturell.. rlhe brace 14 is then adjusted to hold the guide way 2 in the preferred angular relation to the supporting post l. The carriage 26 is then placed upon the guide way 2and the drillv 21 inserted in the sockets 22 with its forward end resting iu the saddle 2Q. Alfter starting the motor 23 the carriage-will be pushed forward to cause the drill`2l to engage the coal to cut it. lf the coal be relatively soft the pressure of the operators handupon the motor 23 will be sutlicient to force the drill in-to the coal If, however, the coal is harder than can be conveniently cut by the pressure'of the hand against the motor, the feeding'pinion' 35 may be placed in position upon the guide angles 30 with the sprocket teeth 36 engaging the apertures 37, and rotated to cause the shaft 34 to enter and find a bearing in the bearing notches 33. Rotative pressure upon the hand crank 38 drill tend to revolve thepinion:to force the sliding carriage 26 forwardly to feed the drill into the coal. By the adjustment of the length ot' the crank as provided for by the slotted. aperture l0, the leverage may be varied to produce a. pressure upon the drill point proportionate to the hardness of the foal. After the hole has been drilled to the des'.V depth the feed shaft may be removed, the sliding carriage 2G and motor 23 drawn rearwardly of the guide way and removed therefrom, the post 1 and guide way 2 disassembled, after which the drill tool 21 may be withdrawn from the hole by the hand of thev operator.

As stated, l provide an apparatus by which drilling can be effected in materials varying widely in theirhardness and resistance to the cutting action. For very hard coal or other substance to be drilled, a powerful motor can be used, together with strong, heavy feeding devices and a heavy supporting frame; and yet the several parts are separable to such an extent that they can be readily manipulated when they are to be lifted to or taken from their working positions. Jand after being assembled the tool is universally adjustable.

'lf the material to be drilled is soft and less resisting, a number of the parts of the entire apparatus can be dispensed with. The motor is separable from the carriage and'is so constructed that it can be readily put into operative position, as it does not require any particular positioning in respect to its axis. lt tits .into its support or holder no matter how it is angulated around its axis, and can be rigidly fastened in whatsoever position it assumes. rlhere is no bodily stationary gearing supplemental to the motor shaft and, no matter what position it assumes, if it lies in proper transverse planes, there is no interference with its operative relation either to the drill or the other devices.

Again, the mechanism by which the power for feeding is transmitted is readily separable from the carriage, or motor support, and the motor. As above explained, when the material is yrelatively soft the rotary feeding devices may be dispensed with and the advance of the drill effected by the pushing force of the operators hand; when the line of the work is inclined downward the weight of the essential parts is often sufficient.

lllhat I claim is- 1. In a drilling machine, the combina-tion of a frame having spaced apart guide rails, a motor carriage slidably mounted on said guide rails, a motor detachably secured to said carriage, a drill operatively connected with said motor, independent carriage moving means removably and rotatably mounted in open bearings in rear of said motor carriage, and means on said guide rails engaged by said carriage moving means to advance itself and said motor carriage `on said guide rail.

2. In a drilling machine, the combination of a frame having spaced apart guide rails provided with a series of tooth engaging sockets, a motor carriage slidably mounted on said guide rails, a motor detachably secured to said carriage, a drill operatively connected With said mot-or, a rotary shaft having toothed drive Wheels removably mounted in open bearings in rear of said motor carriage with its drive Wheels engaged with the sockets on said guide rails, and means for rotating said shaft to ad- Vance it and said motor carriage along said guide rails.

3. In a drilling machine, the combination ot' a frame having spaced apart guide rails provided With tooth receiving apertures, a motor carriage slidaloly mounted on said guide rails, journal blocks having open bearings at their rear ends on either side of said carriage, a motor detachably secured to said carriage, a drill operatively connected With said motor, a manually Operable Shaft removably mounted in the open bearings of said journal blocks in rear of said carriage, and toothed Wheels carried by said shaft and engaging the apertures in said guide rails to advance said shaft and motor carriage on said guide rails.

In testimony whereof, I alix my signature.

NILS D. LEVIN. 

